(5X^2-7X+21)+(6X^2+9X)=

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Solution for (5X^2-7X+21)+(6X^2+9X)= equation:


Simplifying
(5X2 + -7X + 21) + (6X2 + 9X) = 0

Reorder the terms:
(21 + -7X + 5X2) + (6X2 + 9X) = 0

Remove parenthesis around (21 + -7X + 5X2)
21 + -7X + 5X2 + (6X2 + 9X) = 0

Reorder the terms:
21 + -7X + 5X2 + (9X + 6X2) = 0

Remove parenthesis around (9X + 6X2)
21 + -7X + 5X2 + 9X + 6X2 = 0

Reorder the terms:
21 + -7X + 9X + 5X2 + 6X2 = 0

Combine like terms: -7X + 9X = 2X
21 + 2X + 5X2 + 6X2 = 0

Combine like terms: 5X2 + 6X2 = 11X2
21 + 2X + 11X2 = 0

Solving
21 + 2X + 11X2 = 0

Solving for variable 'X'.

Begin completing the square.  Divide all terms by
11 the coefficient of the squared term: 

Divide each side by '11'.
1.909090909 + 0.1818181818X + X2 = 0

Move the constant term to the right:

Add '-1.909090909' to each side of the equation.
1.909090909 + 0.1818181818X + -1.909090909 + X2 = 0 + -1.909090909

Reorder the terms:
1.909090909 + -1.909090909 + 0.1818181818X + X2 = 0 + -1.909090909

Combine like terms: 1.909090909 + -1.909090909 = 0.000000000
0.000000000 + 0.1818181818X + X2 = 0 + -1.909090909
0.1818181818X + X2 = 0 + -1.909090909

Combine like terms: 0 + -1.909090909 = -1.909090909
0.1818181818X + X2 = -1.909090909

The X term is 0.1818181818X.  Take half its coefficient (0.0909090909).
Square it (0.008264462808) and add it to both sides.

Add '0.008264462808' to each side of the equation.
0.1818181818X + 0.008264462808 + X2 = -1.909090909 + 0.008264462808

Reorder the terms:
0.008264462808 + 0.1818181818X + X2 = -1.909090909 + 0.008264462808

Combine like terms: -1.909090909 + 0.008264462808 = -1.900826446192
0.008264462808 + 0.1818181818X + X2 = -1.900826446192

Factor a perfect square on the left side:
(X + 0.0909090909)(X + 0.0909090909) = -1.900826446192

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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